We should cultivate the trustworthiness among people: once you(make)______a promise, you should keep it.

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问题 We should cultivate the trustworthiness among people: once you(make)______a promise, you should keep it.

选项

答案make。

解析 本题考查once引导条件状语从句的用法。once引导的状语从句不能用将来时,如果谓语动词是将来发生的动作,句子常用一般现在时代替将来时,故空格处应使用动词原形make。
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